Computer the arithmetic mean for the following data

Explanation

The above data may be written as

Here, h=10
Let assumed mean = midpoint of (30-40)=35
?Now, we form the table as under


`therefore " mean " barx={A+(hxx(Sigmaf_ixxu_i))/(Sigmaf_i)}={35+((10xx(-48))/(75))}`
=35-6.4=28.6